<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>两列式布局</title>
<style>
    *{
        margin: 0;
        padding: 0;
    }
    .container{
        /* display: flex; */
    }
    .aside,.main{
        height: 500px;
    }
    .aside{
        float: right;
        width: 300px;
        background-color: green;
    }
    .main{
        /* flex: 1; */       
        background-color: red;
        /* float: left; */
        /* width:calc(100%-300px); */
        /* margin-right: 300px; */
        overflow: hidden;
    }
</style>
</head>
<body>
    <!-- 自适应的两列式布局
        设计一套布局  ，两列式布局  aside  300px 剩下的交给main
        左右
        测边栏固定宽度， 主栏宽度自适应
    -->
    <div class="container">
        <aside class="aside"></aside>
        <div class="main"></div>
    </div>
</body>
</html>